Influence of resonance tube length on performance of thermoacoustically driven pulse tube refrigerator

A resonance tube is an important component of a thermoacoustic engine, which has great influence on the performance of the thermoacoustically driven pulse tube refrigerator. A standing wave thermoacoustic engine is simulated with linear thermoacoustics. Computed results show that an appropriate accretion of the resonance tube length may lead to a decrease of the working frequency and an increase of the pressure amplitude, which will improve the match between the thermoacoustic engine and the pulse tube refrigerator. The theoretical prediction is verified by experiments. A refrigeration temperature as low as 88.6 K has been achieved with an optimized length of the resonance tube, helium as working gas, and 2200 W of heating power.     

基于 ADuC812开发板的内燃机试验数据采集系统

介绍了一种基于ADuC812开发板的内燃机试验参数采集展统，给出了系统相关的电路图和程序框图，并就此系统中软件的关键部分予以说明。该系统具有体积小、价格低、使用方便等特点。     

车载GPS接收机与PC机的串口通讯及数据截取

文章苗述了车载定位导航系统中GPS(Global Positioning System，GPS)接收机的通讯协议及与PC机通讯的硬件电路，利用VC的通讯控件实现了二者之间的串行通讯，并根据需要对接收到的信息进行分离提取。     

A Knowledge Discovery System with Support for Model Selection and Visualization

The process of knowledge discovery in databases consists of several steps that are iterative and interactive. In each application, to go through this process the user has to exploit different algorithms and their settings that usually yield multiple models. Model selection, that is, the selection of appropriate models or algorithms to achieve such models, requires meta-knowledge of algorithm/model and model performance metrics. Therefore, model selection is usually a difficult task for the user. We believe that simplifying the process of model selection for the user is crucial to the success of real-life knowledge discovery activities. As opposed to most related work that aims to automate model selection, in our view model selection is a semiautomatic process, requiring an effective collaboration between the user and the discovery system. For such a collaboration, our solution is to give the user the ability to try various alternatives and to compare competing models quantitatively by performance metrics, and qualitatively by effective visualization. This paper presents our research on model selection and visualization in the development of a knowledge discovery system called D2MS. The paper addresses the motivation of model selection in knowledge discovery and related work, gives an overview of D2MS, and describes its solution to model selection and visualization. It then presents the usefulness of D2MS model selection in two case studies of discovering medical knowledge in hospital data—on meningitis and stomach cancer—using three data mining methods of decision trees, conceptual clustering, and rule induction.     

应用型计算机专业学生培养模式探讨

本文探讨了应用型本科院校中计算机专业学生的培养模式,提出了培养高级计算机应用人才的根本途径和当前要解决的主要问题。     

基于数字电力系统的地区配电网络统一数据平台的研究

基于数字电力系统的思想 ,根据地区配电网络的特点 ,对数据进行分类 ,建立关系数据库的组织关系 ,提出了一种利用集合以及图论知识构建地区配电网络统一数据平台的方法 ,确保数据的共享性、一致性、唯一性 ,并符合数字电力系统的要求 ,具有普适性。同时结合实例 ,在该数据平台上 ,利用特征映射的方法 ,进行查询 ,效果令人满意。     

江苏电网EMS中网络通信的应用

首先叙述了网络通信方式相比于传统远动方式的巨大优势；然后从江苏电网的实际情况出发，对网络通信涉及的各个层次进行了分析，其中重点探讨了与能量管理系统(EMS)联系最为紧密的应用层协议的选择；最后，以江苏省目前的网络通信建设状况为依据，进一步验证了网络通信方式的优越性，并在肯定现有成绩的基础上，提出了对今后发展的建议和对未来的展望。     

电容式两相流层析成象系统仿真研究

以油料在管道中输送为例进行电容层析成象仿真.利用有限元方法对电场建立数学模型,在SGI indigo 2 工作站上,使用AVS可视化软件和反投影算法,对3种典型流态模型反演及显示其流体成份分布的图象.     

基于Wirdows NT平台的USB设备驱动程序开发

介绍了National Semiconductor公司的USBN9603／USBN9604模块在Microsoft Windows NT平台上PC端USB设备驱动程序的开发过程以及该驱动程序的结构，并就与此相关的USB和WDM作了简单说明。     

互动式教学模式在实践中的运用

论述了互动式教学模式依据的理论基础、涵义以及在课堂实践中的具体实施，旨在唤起和培养学生参与课堂活动意识，创造一种轻松、和谐、互补的教学环境，从而提高学生的语言应用能力。